Landlord says air conditioning not allowed, apt is sweltering.

I’ll keep it brief, I’ve lived in the same Capitol Hill apartment for 15 years. It’s old and shitty and beautiful, on the top floor. And it’s a great deal.

Every year it gets hotter, y’all know, it’s at the point where if we have a stretch of days consistently in the 80s and 90s, my apartment can get between 90 – 100° in the afternoon, it’s unlivable. My pets can’t take it so we use A/C. No issue. But lately my building manager has been saying window units aren’t allowed. After 15 years? Fine, so I bought a portable standing one.

NOPE! Here’s the kicker, they’re saying portable a/c’s aren’t allowed either because of water damage concerns? They’re literally saying we have no options, we’re not allowed to use AC. Is this legal? I honestly don’t know what to do. I know the box fans in the window trick, it just doesn’t do enough. We only have windows on one side of our apartment. Am I going to need to vacate during certain days in the summer?

Advice?

Edit: We are not currently on a lease :/ the building doesn’t make us resign after the year. I know, I know. Like I said, 15 years, very good deal.